The easier program is to use for casual user, the harder it is to use for advanced user. And vice versa.
This is actually
almost completely false.
There's actually simpler and more accurate way to put it: The easier program is to use, the easier it is to use, and the harder program is to use, the harder is to use :)
That's about it... If in near or far future manage to weed out all the technical settings that can be automatized, mostly those in performance tab, then it all comes down to just making art. And camera settings being in camera itself makes it actually more convenient, or having postprocessing in VFB exclusively, because you can't really tweak most of those things without seeing what you are doing on actual picture anyway.
It just requires a bit of mindset change. Same mindset change was required before for people who were used to the idea that IBL is actual dome light present in your scene, and not just direct sampling of the environment. It took a while, but people do not request domelight anymore and oppose it mostly.
It may take some adaptation time for current users but it won't make workflow any slower or harder. Things will just be on more convenient places and newbies to 3D will generally have easier time adapting because they will find those things on those convenient places. But please take this as general speech, do not convolute it around the environment override case. I already said enviro overrides will probably stay the way they are now for a while.
I drifted a little too far away from the point I was trying to make. There's not that much difference between what beginner and pro user needs. In general, if things are easy to use for newbie, they will be easy to use for pro user as well, and vice versa. The less of a renderer wall there is standing between you and the art you are trying to create, the better.